82FanTC

iTrader: (9)

Today I hooked up a 30 amp relay to my holly red to try and get cleaner current. I followed instructions in a couple of threads I found and it works but it didn't seem to do a damn thing. My pump still surges with the turn signals, breaks, lights, etc. I was wondering if I did everything right:

I ran 10 gauge wire from my 2nd gen fuse block with a 30 amp fuse installed back to the storage compartment and hooked that up to the #30 on the relay. I hooked the #85 to sheet metal in the storage bin for a ground, hooked the positive for the fuel pump up to the #87, and hooked up the negative from the fuel pump back up to the original black wire from the original wiring.

Like I said it works but there is no difference in the surging

rxforspeed

iTrader: (3)

I'm assuming that you're using a standard Bosch-style 30/40 AMP 12VDC coil automotive relay, correct? If you don't already have one, I'd suggest you purchase a pre-wired socket for it at your local auto parts store...

I'm also assuming that your position 30 is connected to an ignition hot fuse, right? Otherwise, your fuel pump would run continuously if it were correctly wired.

It sounds like your 10AWG fused wire is connected properly to position 30 on the relay, but it doesn't sound like your other connections are correct. No matter what type of relay you have (SPST or SPDT relay-SPDT will have an 87A position, which is normally open, or NO, where the 87 position is NC, or normally closed-SPST will only have an 87), you'll want to make sure that the output wire directly to the fuel pump positive terminal FROM RELAY POSITION 87 is the same gauge as the fused igniton hot wire connected to relay position 30 (10AWG in your case), and you'll want to hook your factory fuel pump positive wire to either the 85 OR 86 position on the relay. Ground the other (85 OR 86) position with the same gauge wire as your factory fuel pump positive wire, and run a new 10AWG ground wire from your fuel pump's negative terminal to a bare metal spot on the chassis or to another good grounding point.

The 85 and 86 positions on the relay are the coil wires and can be connected to either positive or negative to work properly. If you have a SPDT relay (it'll have an 87A terminal), make sure that you cover the 87A terminal with heat shrink or another permanent method to keep it from being exposed. If the 87A terminal were to come in contact with a ground when your ignition is off, your fuse will blow.